You realize if your account security is compromised/you've ever been banned/penalized for it then that's LITERALLY the perfect reason to disable gifting since it could happen again? You weren't vigilant in your account security, you should be glad there aren't harsher consequences.
There is no getting "hacked", ESO doesn't have some backdoor that a hacker utilized to enter your account through, at least not any widely publicized thing like that, you likely clicked a suspicious link without verifying, got malware and gave up your own security yourself.
Now if they bought something with your crowns you already had then I do hope you get your refund, but I personally wouldn't trust your account with gifting after an incident like that if I was in any kind of position that could grant it.